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Assets/ModuleUnit/UnitFind/FindSideIntersectPoint.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+/// <summary>
+/// 查询边交点
+/// </summary>
+public class FindSideIntersectPoint : UnitFind<SideIntersectPoint> {
+    public readonly float FindRange = 0.01f;
+    /// <summary> 板片资产 </summary>
+    public ModuleAssets<DataPlate> AssetsPlate => ModuleCore.I.AssetsPlate;
+
+    /// <summary> 查询边交点 </summary>
+    public FindSideIntersectPoint() { }
+
+    public bool Find(Vector3 position, out SideIntersectPoint sip) {
+        sip = new SideIntersectPoint();
+        List<DataPlate> plates = AssetsPlate.Datas;
+        for (int i = 0; i < plates.Count; i++) {
+            Vector3 localPosition = position - plates[i].dataDesign.position;
+            sip.side = Find(plates[i], localPosition, out sip.intersectPoint);
+            sip.intersectPoint += plates[i].dataDesign.position;
+            if (sip.side != null) { return true; }
+        }
+        return false;
+    }
+    /// <summary> 查询匹配的边 </summary>
+    private DataPlateSide Find(DataPlate plate, Vector3 localPosition, out Vector3 intersectPoint) {
+        intersectPoint = Vector3.zero;
+        for (int i = 0; i < plate.plateSides.Count; i++) {
+            DataPlateSide side = Find(plate.plateSides[i], localPosition, out intersectPoint);
+            if (side != null) { return side; }
+        }
+        return null;
+    }
+    /// <summary> 查询匹配的边 </summary>
+    private DataPlateSide Find(DataPlateSide side, Vector3 localPosition, out Vector3 intersectPoint) {
+        intersectPoint = Vector3.zero;
+        for (int i = 0; i < side.dataDesign.lines.Length; i++) {
+            Vector3 a = side.dataDesign.lines[i].a;
+            Vector3 b = side.dataDesign.lines[i].b;
+            float distance = ProjectDistance(a, b, localPosition, out intersectPoint);
+            if (distance < FindRange) { return side; }
+        }
+        return null;
+    }
+
+    /// <summary>
+    /// 向量投影法
+    /// 计算点c到线段ab最近的点
+    /// </summary>
+    /// <param name="a"></param>
+    /// <param name="b"></param>
+    /// <param name="c"></param>
+    /// <returns>如果不在线段上返回 float.MaxValue</returns>
+    public static float ProjectDistance(Vector3 a, Vector3 b, Vector3 c, out Vector3 intersectPoint) {
+        Vector3 ab = b - a;
+        Vector3 ac = c - a;
+        Vector3 p = Vector3.Project(ac, ab);
+        intersectPoint = p + a;
+        if (ab.normalized != p.normalized) { return float.MaxValue; }
+        if (ab.magnitude < p.magnitude) { return float.MaxValue; }
+        return Vector3.Distance(c, p + a);
+    }
+}
+/// <summary>
+/// 边交点
+/// </summary>
+public class SideIntersectPoint {
+    /// <summary> 匹配的边 </summary>
+    public DataPlateSide side;
+    /// <summary> 交点 </summary>
+    public Vector3 intersectPoint;
+}

Assets/ModuleUnit/UnitFind/FindSideIntersectPoint.cs.meta

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Assets/ModuleUnit/UnitFind/UnitFind.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public interface UnitFind<Data> {
+    /// <summary> 查询 </summary>
+    public bool Find(Vector3 position, out Data data);
+}

Assets/ModuleUnit/UnitFind/UnitFind.cs.meta

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